I was thinking the exact same thing. It seems absolutely wrong that I have to go into testing the game to access the this editor. It's a "behavior" editor. I should be able to edit it along with the rest of the behaviors, right there in the main editor.
Intel i9-10900K 5.10GHz, 64 GB RAM, Nvidia GTX 1080 ti 11GB, Windows 10 64-bit, dual monitor display